Hot-air furnace.



E. C. THOMPSON.

HOT AIR FURNACE.

APPLICATION FILED JUNE 3.1914.

1,148,725. Patented Aug. 3, 1915.

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E. C. THOMPSON.

HOT AIR FURNACE.

APPLICATION FILED JUNE 3. 1914.

Patented Aug. 3, 1915.

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mailman srarns PATENT enrich.

HOT-AIR FURNACE.

Application filed June 3, 1914.

To all whom it may concern Be it known that I, EDWARD C. THOMP- SON, a citizen of the United States, residing at Marshall, Michi an, have invented certain new and useful Improvements in Hot- Air Furnaces, ofwhich the following is a specification.

This invention relates to improvements in hot air furnaces.

The main objects of this invention are: First, to provide an improved hot air furnace of high efliciency. Second, to provide an improved hot air furnace of large air heating capacity which is at the same time compact in structure.

Further objects, and objects relating to structural details, will definitely appear from the detailed description to follow:

I accomplish the objects of my invention by the devices and means described in the following specification.

The invention is clearly defined and pointed out in the claims.

A structure which is a preferred embodiment of my invention is clearly illustrated in the accompanying drawing forming a part of this specification, in which:

Figure I is a vertical central section from front to rear of a hot air furnace embodying the features of my invention. Fig. II is a detail horizontal section through the combustion chamber on a line corresponding to line 2-2 of Fig. I. Fig. III is a horizontal section through the combustion chamber on a line corresponding to line 3-3 of Fig. I. Fig. IV is a horizontal section through the combustion chamber on a line corresponding to line lft of Fig. I. Fig. V is a detail vertical section on a line corresponding to line 55 of Fig. II. Fig. VI is a detail horizontal section on a line corresponding to the broken line 66 of Fig. I.

In the drawing similar reference charac ters refer to similar parts throughout the several views, and the sectional views are taken looking in the direction of the little arrows at the ends of the section lines.

Referring to the drawing, 1 represents the fire pot, 2 the ash pit and 3 the combustion chamber of a hot air furnace, the ash pit and fire pot being shown in conventional form. The hot air chamber or casing 4E surrounds the ash pit, fire pot andcombustion chamber as is common practice. The combustion chamher 3 is seated upon an upwardly flaring flange 5 on the upper end of the fire pot.

Specification of Letters Patent.

Patented Aug. 3, 1915.

Serial'No. 842,561.

Within the combustion chamber I arrange a plurality of air heating drums, the drums being disposed in a spaced relation one above another. The structure illustrated has three drums. The top and bottom drums 6 are annular and are disposed with their outer edges close to the wall of the combustion chamber, and the central or intermediate drum 7 is centrally disposed with its edges in a spaced relation with the walls of the fire pot so that the drums constitute baffie members. The hot gases and products of combustion strike the bottom of the lower annular drum and pass through the center thereof striking against the bottom of the intermediate drum 7 and pass between it and the top of the lower drum and thence over the intermediate drum and against the under side of the top drum, through the center of which they pass.

I preferably provide a baflie plate 8 which is disposed above the top drum with its outer edges in a spaced relation to the walls of the combustion chamber so that the prodnets of combustion may pass around the same. The hot gases are directed by this baffle plate across the top of the top drum. The baffle plate is provided with-a central damper 9. The means for opening and closing this damper are not shown as they form no part of my present invention.

The combustion chamber is provided with a central discharge flue 10. The drums are connected to each other and to the hot air chamber by suitable flues. The flues 11 which connect the lower drum to the air chamber open through the flange 5 so that the air is caused to circulate against the we ll of the fire pot.

The bottom drum 6 is connected to the intermediate drum by flues 12, while the intermediate drum is connected to the top travel across so that they travel in contact with the walls and their passage through the furnace is not seriously impeded.

In hot air furnace installations there is frequently some particular room, or rooms, which, on account of its location, is difficult to heat. For such cases I provide a delivery flue 15 for one of the discharge fines let, the delivery flue being arranged to deliver into the flue 16 somewhat like an injector. This insuresa circulation in the conduit 16 and the conduit 16 is not robbed by the other conduits, as 16, leading from the hot air chamber to other rooms. The fiues connecting the drums with the hot air chamber and with each other are preferably staggered or arranged out of alinement, as shown, which causes the air to pass over or come in contact with a greater heating area than would otherwisebe the case.

The hot gases and products of combustion, owing to the arrangementof the heating drums, come in contact with the tops and bottoms thereof and also are deflected against the connecting fines, so that a very large heat absorbing and radiating surface is secured in the furnace. The products of combustion are also directed against the walls of the combustion chamber in their passage around the drums so that a large portion of the area of these walls is effectively utilized as radiating surfaces.

I have illustrated and described my improvements in a simple and practical em bodiment, without however, attempting to maintain proper proportions of parts and certain parts being shown conventionally, as it, is believed the proper proportions and embodiment will be readily understood by those skilled in the art to which my invention re lates. I have not attempted to illustrate or describe various embodiments which I contemplate, as I believe the disclosure made will enable those skilled in the art to which my invention relates to embody or adapt the same as conditions may require. I desire, however, to be understood as claiming my improvements specifically in the form illustrated as well as broadly Within the scope of the appended claims.

Having thus described my invention what I claim as new and desire to secure by Let ters Patent, is:

1. In a hot air furnace, the combination of a fire pot provided with an outwardly proj ecting flange at its upper end, a combustion chamber mounted at the edge of said flange, a hot air chamber surrounding said fire pot and combustion chamber, a plurality of air drums disposed. in a spaced relation one above another within said combustion chamber, the bottom and top drums being annular and disposed with their outer edges in close proximity to the walls of the combustion chamber, the bottom drum being disposed in a spaced relation to said fire pot flange, the intermediate drum being disposed centrally with its outer edges in a spaced relation to the walls of the combustion chamber whereby said drums constitute baffle members, the top walls of said drums being flat, the bottom wall of said intermediate drum being convex, the bottom walls of said annular drums being curved in cross section, air 1nlet flues connecting the lower drum with said hot air chamber through flue openings in said fire pot flange, discharge flues connecting the upper drum with said hot air cha1nher through the top of said combustion chamber, and connecting fines for said drums, said inlet, discharge and connecting fines being disposed out of alinement so that the air is caused to circulate within the drums, the capacity of each drum being substantially greater than that of the combined fines delivering thereto.

2. In a hot air furnace, the combination of a fire pot provided with an outwardly projecting flange at its upper end, a combustion chamber mounted at the edge of said flange, a hot air chamber surrounding said fire pot and combustion chamber, a plurality of air drums disposed in a spaced relation one above another within said combustion chamber, the bottom and top drums being annular and disposed with their outer edges in close proximity to the Walls of the combustion chamber, the bottom drum being disposed in a spaced relation to said fire pot flange, the intermediate drum being disposed centrally with its outer edges in a spaced relation to the walls of the combustion chamber whereby said drums constitute baflie members, air inlet flues connecting the lower drum with said hot air chamber through flue openings in said fire pot flange, discharge iiues connecting the upper drum with said hot air chamber through the top of said combustion chamber, and connecting fines for said drums, said inlet, discharge and connecting fiues being disposed out of alinement so that the air is caused to circulate within the drums, the capacity of each drum being substantially greater than that of the combined flues delivering thereto.

3. In a hot air furnace, the combination of a fire pot, a combustion chamber, a hot air chamber surrounding said fire pot and combustion chamber, air drums disposedin a spaced relation one above another within said combustion chamber, one of said drums being annular and disposed with its outer edges in close proximity to the walls of the combustion chamber and an adjacentdrum being disposed centrally with its outer edges in a spaced relation to the walls of the com bustion chamber whereby said drums constitute baflle members, said annular drum being curved in cross section, air inlet flues connecting the lower drum with said hot air chamber, discharge fiues connecting the upper drum with said hot air chamber, and connectmg fines for sa1d drums, sa1d inlet, discharge and connecting flues being disposed out of alinement so that the air is my hand and seal in the presence of tWo caused to circulate Within the drums, the ca- Witnesses.

pacity of each drum being substantially EDWARD O. THOMPSON. [L.s.] greater than that of the combined fines de- Witnesses: 5 livering thereto. JAs. W. GRACE,

In Witness whereof, I have hereunto set WM. SLATER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

